â–¼126. How to save the stripping powder and stripping solution?
Release powder at room temperature, without moisture, protected from light, up to more than two years without deterioration. Release fluid, dark at room temperature, can save about a year.
â–¼127. How to save the screen?
Mesh should be stored in dark, dry place, avoid long-time irradiation with strong UV rays, to prevent aging, reduce tensile strength, such as polyester mesh, nylon mesh, are polymer compounds, poor storage conditions, easily deteriorated.
â–¼128. Why is a yellow screen better than a white screen?
The yellow silk screen absorbs, refracts, reflects, and scatters the light during plate-making exposure. In the image part, the refracted light can be reduced, so the yellow silk screen is better than the white silk screen.
â–¼129 . How is the number of meshes represented?
Refers to the value of the density of the woven net, the number of meshes per inch of the woven wire mesh. In the screen printing, there are products ranging from 15 mesh to 550 mesh, domestic products have 15 to 350 mesh, and the most commonly used is 100 mesh to 350 mesh screen.
â–¼130. How to choose the frame size?
The size of the frame area is generally twice the area of ​​the printed matter. If the screen frame is too small, the accuracy of the printed matter will be reduced. To ensure the printing quality, it cannot be less than 1.8 times the printing area.
â–¼131. How to store the screen frame?
Placed horizontally and vertically, it cannot be heavily compressed to prevent deformation, such as deformation, which can be diagonally corrected on the platform.
â–¼132. When it is apparent, there are several reasons why it cannot be seen.
Partial morphological failure can not be seen, mainly, in the drying process, especially the hair dryer and electric oven drying, local overheating, resulting in thermal cross-linking, photographic film and screen printing film surface is not compacted caused by light cross-linked, so Drying must strictly control the temperature can not be greater than 40 degrees.
â–¼133. The peeling of the exposed film during processing is mainly caused by the following reasons:
(1) Underexposure ensures that the exposure effect reaches the entire screen coating, and the exposure time must be increased in the dyeing and copper meshes.
(2) Insufficient Sensitization of Photosensitive Adhesive must ensure that sufficient amount of photosensitizer is thoroughly mixed with Latex.
(3) Photosensitizer failure
â–¼134. There are several reasons why the fine pattern lines cannot be washed out:
(1) Overexposure
(2) Uneven coating - check if the tension of the tension net is sufficient
(3) Refraction - Dyeing screens are required to make fine patterns
(4) Irregular contact - Use single-layer positive images as much as possible, and make sure that the vacuum suction box can closely attach the positive image to the stencil
â–¼135. The pattern cannot be flushed out completely due to the following reasons:
(1) Excessive exposure is excessive
(2) The coated wire mesh is dried at a high temperature and should be dried at a temperature not exceeding 40 °C.
(3) When exposed to light when dry, should be dried under a yellow safety light or soft light
(4) The coated screen has been stored too long
â–¼136. Premature peeling of the film is caused by the following reasons:
(1) The screen is not taut
(2) Insufficient exposure
(3) Inappropriate pre-processing
â–¼137. Pinholes on the screen are caused by the following reasons:
(1) Dust particles on glass or sun pictures
(2) The latex has been soiled. Remember to keep the working environment clean and cover the unused photosensitive adhesive.
â–¼138. The sawtooth line is caused by the following reasons:
(1) The mesh is too thick or non-stained - fine lines require fine meshes, and meshes exceeding 196/inch (77 cm/cm) require dyeing
(2) Improper flushing - Do not use excessive flushing pressure. Wet the wire mesh on both sides Allow the cream to soften for about 60 seconds. Flush with the general water at the bottom of the screen.
â–¼139. The main reasons for stencil are:
(1) Improper flushing - Make sure the image is completely clear
(2) Bad absorption of excess water after washing
â–¼140. Printing pad performance and characteristics
The plastic head is one of the necessary raw materials for the pad printer. The plastic head is divided into two types: white and blue. The raw material of the white plastic head is from France and the raw material of the blue plastic head is from Japan. From the shape of the A, B, C, S four series. According to the specific printing requirements of the user to make a specific type of plastic head. Divided from the hardness of the standard (conventional supply), special soft, special hard three. The standard hardness is approximately 20 °C Shore, and special soft and special hard are supplied according to the user's needs. The rubber head has ideal elasticity and flexibility. For the printing of fine line patterns on flat and irregular surfaces, it can ensure a clear printing effect. The rubber head is completely covered with ink, and it is easy to deink and transfer. The residual ink is easily removed and the service life is long.
â–¼ 141. What is "printing" printing?
The principle of pad printing is to use the method of photographic plate making the desired printing pattern first, and then make the steel plate into a gravure and transferring it onto the object to be printed via a special adhesive printing head, and can be used for different purposes according to the material of the product. Ink, so that the quality is guaranteed. The flow of the printing machine is divided into the following four points: 1. The ink is evenly covered by the brush on the steel plate. 2. The excess ink is scraped off by a doctor blade. 3. Decrease the ink from the print head to the steel plate. 4. Drop the print head down until the product covers the pattern. Pad printers for the industry: plastics, toys, glass, metal, electronics, sporting goods, stationery, optical industry, IC packaging industry. Pad printer application scope: ruler, pen, ball, doll eyes, watches, cameras, hair dryer shell, ceramics, medical equipment, rackets, tapes, electronic components, IC, CPU, DRAM, computer shell, buttons, decorative signs , Brother big case printing.